Electric Current and Circuits

Electric Current

whenever electric charges of like signs move, rate at which the charge flows through this surface

Unit—>Ampere (A)

Ammeter—>used to measure it

I=Q/t

I=V_/R

Resistance

the constant of proportionality, resists the flow of electrons

Unit—>Ohms (Ω)

Example: series R=R₁+R₂+R₃

Voltage

the difference in electric potential between 2 points

Voltmeter—>used to measure it

Unit—>volt

V=IR

Power

rate at which the energy is lost

Unit—>Watts

P=triangle(Q)/triangle(t) x triangle(V)=I(triangle)V

P=E/t

Electrical Energy

the power an atom’s charged particles have to cause an action or move an object

V=IR

Ohms Law

in a closed circuit, the electric current is directly proportional to the electric voltage

ΔV = I R

Circuits

Parallel (1/R=1/R₁+1/R₂+1/R₃)

Series (R=R₁+R₂+R₃)

Resistance in Series

when 2 or more resistors are connected end to end

R=R₁+R₂+R₃

Resistance in Parallel

When two or more resistors are connected side by side, sharing the same voltage points in an electrical circuit

1/R=1/R₁+1/R₂+1/R₃